Question

TScrollbox: How can I prevent automatic "scrollintoview" of large components?

Asked by: waeberd

Hi, a very annoying problem using BDS2006:

I have a Form with a Scrollbox containing two TStringGrids aligned vertically.
The StringGrids are sized so that the bottom one is only partly displayed on the Form, the ScrollBox allows accessing the whole StringGrid.

The problem: if I click the bottom StringGrid (which is partly visible), the Scrollbox "jumps" so that the clicked StringGrid scrolls into view completely. I want to be able to click the StringGrid without any "jump effect" on the scrollbox!
How can I do this?

unit1.pas
==============================
unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Grids;
 
type
  TForm1 = class(TForm)
    ScrollBox1: TScrollBox;
    StringGrid1: TStringGrid;
    StringGrid2: TStringGrid;
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
end.
==============================
 
unit1.dfm
==============================
object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 533
  ClientWidth = 742
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object ScrollBox1: TScrollBox
    Left = 0
    Top = 0
    Width = 742
    Height = 533
    Align = alClient
    TabOrder = 0
    ExplicitWidth = 688
    object StringGrid1: TStringGrid
      Left = 5
      Top = 5
      Width = 668
      Height = 300
      RowCount = 20
      TabOrder = 0
    end
    object StringGrid2: TStringGrid
      Left = 5
      Top = 311
      Width = 668
      Height = 400
      RowCount = 20
      TabOrder = 1
    end
  end
end
==============================

                                  
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:
72:
73:
74:
75:

Select allOpen in new window

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2009-05-12 at 07:03:54ID24401230
Tags

Delphi

,

vcl

,

TScrollbox

,

ScrollIntoView

Topic

Delphi Programming

Participating Experts
2
Points
500
Comments
8

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. Coordinates in a TScrollBox
    I am writing a component that includes a TScrollBox. Into this ScrollBox I put several labels (TLabel). After inserting a Label I increase the position variables (CurrentX, CurrentY) to identify the position for the next label that may be inserted. All this works fine if I do...
  2. Scrollbox
    hello :) i have a deadline on this project on thursday. can someone here tell me how save an entire scrollbox as a image?. any method (which does not require any componnents is acceptable) preferably save it as a .gif file ? please help!!!
  3. Tstringgrid and sort
    Hi to all, i have a Tstringgrid and i want to sort it . Is there a property which i can use (i did not find one) and say: sort the first column, or sort the third column, or .... Or is this not possible and i have to code the sort by myself ? (i have D3) Thanks titz
  4. StringGrid
    Hello all Is it possible to sort date with StringGrid component ? becouse i try and i didnt find ... Thanks
  5. Column Alignment Setting in StringGrid
    I'd like to set a column alignment in a StringGrid component. Can Anyone tell me how to set it? ysimon
  6. TstringGrid
    hello all i use stringGrid component,i want to select the row in TStringGrid not by mouse click but by Button,

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: rllibbyPosted on 2009-05-12 at 07:53:33ID: 24365240

You can create a component derived by TScrollBox, and then override the TScrollingWinControl.AutoScrollInView.

Eg:

--------------------------------
unit ScrollBoxEx;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;

type
  TScrollBoxEx      =  class(TScrollBox)
  private
     // Private declarations
  protected
     // Protected declarations
     procedure      AutoScrollInView(AControl: TControl); override;
  public
     // Public declarations
  published
     // Published declarations
     property       Align;
     property       Anchors;
     property       AutoScroll;
     property       AutoSize;
     property       BiDiMode;
     property       BorderStyle;
     property       Constraints;
     property       DockSite;
     property       DragCursor;
     property       DragKind;
     property       DragMode;
     property       Enabled;
     property       Color nodefault;
     property       Ctl3D;
     property       Font;
     property       ParentBiDiMode;
     property       ParentColor;
     property       ParentCtl3D;
     property       ParentFont;
     property       ParentShowHint;
     property       PopupMenu;
     property       ShowHint;
     property       TabOrder;
     property       TabStop;
     property       Visible;
     property       OnCanResize;
     property       OnClick;
     property       OnConstrainedResize;
     property       OnContextPopup;
     property       OnDblClick;
     property       OnDockDrop;
     property       OnDockOver;
     property       OnDragDrop;
     property       OnDragOver;
     property       OnEndDock;
     property       OnEndDrag;
     property       OnEnter;
     property       OnExit;
     property       OnGetSiteInfo;
     property       OnMouseDown;
     property       OnMouseMove;
     property       OnMouseUp;
     property       OnMouseWheel;
     property       OnMouseWheelDown;
     property       OnMouseWheelUp;
     property       OnResize;
     property       OnStartDock;
     property       OnStartDrag;
     property       OnUnDock;
  end;

procedure Register;

implementation

procedure TScrollBoxEx.AutoScrollInView(AControl: TControl);
begin
  // No-op
end;

procedure Register;
begin
  RegisterComponents('Win32', [TScrollBoxEx]);
end;

end.

-------------------

- Save component source
- Install the component
- Change the dfm (view as text) to read:

 object ScrollBox1: TScrollBoxEx

- Change the form declaration to read

type
  TForm1 = class(TForm)
    ScrollBox1: TScrollBoxEx;

----------

Regards,
Russell




 

 

by: HypoPosted on 2009-05-12 at 08:08:43ID: 24365439

The auto scrolling is generated by the function AutoScrollInView, which is called from the SetFocusedControl function (which is called when you change focus, like clicking in the other grid). You can disable this by deriving the TScrollBox class locally in your unit, with the same name, and then override the AutoScrollInView with an empty function. I don't know if it is the best way to do it in this case, but it works.
Setting the TScrollBox.AutoScroll property to false prevents auto scrolling, but it also removes the scroll bars, and I don't think that's what you are looking for.

regards
Hypo

Add this type to above your form declaration in your unit... 
type
  TScrollBox = class(Forms.TScrollBox)
   protected
    procedure AutoScrollInView(AControl: TControl); Override;
  end;
 
  TForm1 = class(TForm)... 
 
...
// Then add code this to your implementation part
procedure TScrollBox.AutoScrollInView(AControl: TControl);
begin
  // Do nothing 
end;
  

                                              
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:

Select allOpen in new window

 

by: HypoPosted on 2009-05-12 at 08:09:26ID: 24365445

Damn, I was slow... :)

 

by: rllibbyPosted on 2009-05-12 at 08:15:49ID: 24365529

Hypo,

Your method is actually simpler to implement (both do the same thing by stubbing the method).

Russell

 

by: HypoPosted on 2009-05-12 at 08:21:41ID: 24365626

Yeah,
It's a quick n' dirty sollution I saw somewhere on this forum a couple of months ago, it was another control, but the principals was the same; and It's a nice way to tweak your standard VCL's when you need to change their behaviour to test something quickly. :)

regards
Hypo

 

by: rllibbyPosted on 2009-05-12 at 08:24:19ID: 24365657

I have used it before, but my delphi is starting to get rusty from too much C++ work ;-)

Russell

 

by: waeberdPosted on 2009-05-12 at 08:46:50ID: 31580533

wow, thanks a million!

 

by: waeberdPosted on 2009-05-12 at 08:47:29ID: 24365943

Thanks a lot! Fast, helpful answers!

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...